Neutral coloring photochromic 2H-naphtho[1,2-b] pyrans and heterocyclic pyrans
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United States of America Patent
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Jun 19, 2001
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app pub date -
Nov 1, 1999
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Mar 25, 1997
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Abstract
Compositions comprising a naphtho [1,2-b]pyran of formula (I): ##STR1## wherein R.sup.7 and/or R.sup.9 is hydrogen or an amino group provided that R.sup.7 and R.sup.9 are not both hydrogen, and the other substituents are as defined in the specifcation.
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